(19)
(11) EP 1 467 071 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
15.06.2005 Bulletin 2005/24

(43) Date of publication:
13.10.2004 Bulletin 2004/42

(21) Application number: 04008326.3

(22) Date of filing: 06.04.2004
(51) International Patent Classification (IPC)7: F01N 3/023, F01N 9/00
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 08.04.2003 JP 2003104363

(71) Applicant: Nissan Motor Co., Ltd.
Yokohama-shi, Kanagawa (JP)

(72) Inventors:
  • Inoue, Takao
    Yokohama-shi, Kanagawa 233-0002 (JP)
  • Kawashima, Junichi
    Yokosuka-shi, Kanagawa 239-0835 (JP)
  • Tsutsumoto, Naoya
    Yokohama-shi, Kanagawa- 222-0032 (JP)
  • Otake, Makoto
    Yokohama-shi, Kanagawa 241-0014 (JP)
  • Kondou, Terunori
    Yokohama-shi, Kanagawa 221-0001 (JP)
  • Koga, Toshimasa
    Yokohama-shi, Kanagawa 221-0001 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Engine exhaust gas purification device


(57) An engine exhaust gas purification device is disclosed. The purification device has a filter (13) which traps particulate matter contained in the exhaust gas from an engine; a differential pressure detection sensor (16) which detects a differential pressure of the filter; a sensor (14, 15, 21, 31, 33) which detects an engine running state, and a microcomputer (22). The microcomputer (22) is programmed to compute an estimated ash amount ASH_a of the filter based on the detected differential pressure; compute an oil consumption amount OC_total based on the detected engine running state; compute an ash density DENS_ASH from the oil consumption amount OC_total and estimated ash amount ASH_a, and compute an ash amount ASH of the filter based on the oil consumption amount OC_total and ash density DENS_ASH.